Paint spraying appliance



Sept. 20, 1932. s, BRAMSEN ET AL PAINT SPRAYING APPLANCE Filed May 51,1930 Patented Sept. 20, 1932 UNITED STATES PATENTQFFTCE .f

SVEND BRAMSEN AND FRITZ WAI-ILIN, OF CI-IICAGO, ILLINOIS, ASASIGNORS TOBINKS MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORFORATION GFDELA- WARE iAIivr srRAYiNe APPLIANCE Application led May 31, 1930.Serial No. 458,836.` i

Our invention relates to the class of spray appliances in which a streamof compressed air isprojected past the outlet of a liquid r.supply tubeleading from a container on which the air-projecting part of theappliance is mounted, so that the air stream sucks liquid material outof the liquid supply tube and atomizes this liquid.

Generally speaking, the objects of our inld vention are the providing ofan exceedingly light, inexpensive and easily manufactured sprayappliance of this class, and one in which no air valve or otheraccurately machined mechanism is required for controlling the 15am-Y-More particularly, our invention aims to provide a spray appliance ofthis class, in which the volume and distri-butionof the spray can beregulated by adjusting a liquid '25 outlet nozzle, and in which thespraying action is lcontrolled (without interrupting the flow of airthrough the air duct) by means of an air deiiector which is movable intoand out of a position between the air outlet and fthe liquid outlet.Moreover, our invention aims to provide simple, inexpensive and'easily'operated mechanism whereby the user of the appliance can easilyand conveniently f5 control the spraying action. ti

will appear frOm'the followingspeciiication and from the 'accompanyingdrawing, in which l Y.

Fig. 1 is al side elevation of a spray applit; ance embodying ourinvention, with a Vportion of the liquid container broken away,

showing the parts as they are disposed when the spraying isdiscontinued. i v Fig. 2 is a fragmentary view, similar to a 1 1 portionof Fig. 1 but with some parts in section, showing the positions of theair deiiector and the deflector-moving mechanism'as they appear duringthe spraying action. y Fig. 3 is a fragmentary plan view of the 45 capof the liquidcontainer and of parts disposed above this cap. Fig. 4 is afragmentary side elevation, partly inV section, showing a simplifiedform 4of air deflector and defiector-moving mechanism also embodying ourinvention.

Still further and also more detailed objects' In the embodiment of Fig.1, the materialv container consists of a jar 1 and a cap 2' threadedupon the mouth of the jar. `Seated on the top of the cap 2, and clampedto the cap by a screw 3, is the foot l ofa leg 5 which depends from thebarrel or air tube 6v of pistol-shaped spray gun body. This body (whichdesirably is acasting made ofa light metal,I such as aluminum) alsoincludes a handle 7 depending from a more rearward portion of the barrelor airtube 6, andthe barrel has anginlet portion or attaching nipple 6A,projecting rearwardly beyond the upper end of the handle, whichprojection desirably is corrugated (as shown in Fig. 1) to facilitatethe tight attaching of the hose 8 through which compressed air isV.supplied to the air'tube. Thus arranged, the foot land the leg 5 formthe base member for supporting the entire spray gun body (including theair tube, theattaching nipple and the handle) ,which .body can be anintegral castingas for example, of aluminum or an aluminum alloy.

The air tube preferably extends forwardly beyond the leg 5 and has itsforward end tapering forwardly, and the outlet portion O of the yairtube (which outlet portion opens e through this forward end of the tube)is con- Y siderably smaller than the main portion B of l i the bore ofthe air tube, so as "to accelerate ,the

velocityof-theissuing stream of air. 1

Extending, slidably downwardly through the foot 4 of the gun body andthe cap 2r is a liquid supply tube 9'which depends into 'theliquid inthat jar. f This liquid tube also extends through a packing disk 10which is clamped against the lower face of the cap top by a screw Sandwhich effectively seals the Vtube to the cap in additionto affordingthe' usual-seal betweenl the cap and the mouth end of the ar.V

' Threaded penale upper end efneeiiqiidv tube is a liquid nozzle 11,which has anupwardly tapering bore and which presents its tipendsomewhat below the axis MvA 'of dis- Interposed y between the bottomof the liquid nozzle lland. the foot-is a compression spring 12 whichcharge bore O of the airtube.

serves the double purpose of latching the nozzle against rotation on thetube, and of lifting the nozzle and the liquid tube to a position inwhich the bottom of the packing 10 is engaged by a stop collar 13soldered to the tube.`

Extending horizontally through the air tube, behind the tapering tip ofthis tube and above the tube axisA, is a pivot pin 14, which pin'has itsaxis in a plane at right angles to the common vertical plane of the airtube axis A and the liquid nozzle axis N.. Pivoted upon and the outlettip of the air duct, thereby permitting the air deector to be moved intoand out of positions in which it will intercept and deiiect the airissuing from the air tube, so

that this air cannot pass close to the upper or discharge end of theliquid nozzle.

For moving the air deflector,Figs. 1 and 2 show a bar 16 extendingslidably below the air tube through the leg 5 and into a bore 17 in theupper portion of the handle. The forward end of this sliding bar 16`hasa horizontal pin 18 extending through the bar, and each end portion ofthis pin is disposed in a slot 19 formed in the lower end of one of thesides 16 of the delector member, each such slot being elongated radiallyof the axis of they pivot pin "14. A compression spring 20 disposedbetween the rear end of the sliding bar 16 and the rear end of the bore17 continually urges this bar forwardly until stopped bythe engagementof the rear face of the leg 5 with the forward lend of a finger-piece 21which is fastened to the sliding bar by a cross-pinVv 22. Thisfinger-piece depends below the airk tube and between the liquidcontainer vand the handle 7 so as to be easily reached and manipulatedby a finger of a hand grasping the handle. v o Vhe'n the sliding bar isnot digitally retracted, the spring 2O retains it in the position shownin 1, thus holding the air deflectorV member in a position in which theair deflector 15 extends in front of the air outlet O. Consequently,compressed air supplied by the hose 8 and passing through the air tubewill be deflected upwardly and at such a distance from the tip of theliquid nozzle 11 as to exert no ,suction eect for drawing `liquid upvthel liquid tube.

However, when the sliding bar is retracted,

, as shown in Fig. 2, the air deflector is swung entirely below theoutlet ofy the air tube, so that vtlie'issuing air blows across the tipof the' liquid nozzle, thereby sucking liquid out of'thejar'l throughthe liquidtube 9 and the said nozzle, so that this-liquid issues fromthe tip of the nozzle and is atomized into a spray by the stream of airissuing from the air tube.

vWith the parts in this disposition, the total volume, density andspread of the spray can be varied to a considerable extent by merelyrotating the liquid nozzle 11, so as to vary the distance between itstip andthe axis A of the air tube. lVhenever the spraying is to beinterrupted or discontinued, the operator merely releases hisrearwardpressure on the iingerpiece; whereupon the spring 2O slides thebar '16 forward and returns the air deflector to the position shown inFig. 1, in which this deflector diverts the air upwardly and out ofoperative eect on the liquid nozzle and the liquid tube.

To allow the liquid to be sucked out of the jar, the cap 2 is providedwith a suitable air vent, such as the perforation 23 in Fig. 3, therebyallowing the pressure of the Outer air to press down on the liquid inthe jar` so as to force the liquid up the tube 9y and out of the liquidnozzle 11.

l/Vhenthe spring is pushing the slide bar 1G forwardly, the airdeflector 15 swings (in a clockwise direction inv Figs. 1 and so thatits upper edge moves upwardly in front of the tip of the air duct,thereby swinging the air blast upwardly. A As the result of this? upwardtilting or swinging movement of the air blast, the lower edge of theissuing air stream still strikes the tip of the liquid nozzle after themajor portion of the airv has been deflected suihciently to annul itssucking action, thereby blowing oi'f any petty drop of liquid whichotherwisefmight be held in the tip of the liquid nozzle by capillaryaction.

Consequently, we avoid the clogging of this nozzle by having paintor thelike dry in its vtiivo By using a straight bore for the airtube.

and eliminating the need of an air valve, we also obviate a clogging ofthe air outlet by dust in the air, iny addition to avoiding the need ofaccuratelymachinedvalve parts. And,

since the extending of the liquid tube through the cap of the containerprevents the body of the spray gun fromrotating about the screw 3, thissingle screw suffices for securing the spray gun to the container.Moreover, the liquid tube can readily be separated from the cap when thenozzle 11 is unscrewed, so that Vthe user easily has access to all partsfor iiispecting and cleaning them.

However,r while we have heretofore described ourv invention in anembodiment including a sliding member for moving the air deflector inone direction, we do not wish to be limited to this or other details ofthe construction and arrangement thus described, since many changesmight be made without departing either from the spirit of my inventionor from the appended claims.

For example, Fig.'4 shows a portion of an IBL embodiment of' ourinvention' in which the air deflector is integral with the actuatingmember, and in which no sliding member is required. In this embodiment,ythe actuating member is a lever 24 pivoted intermediate of itslengthon ahorizontal pin 25 extending through a riser lug 26 formed onv the airtube V6 at a short distance fromthe tapering tip of this tube, and thislever (which can be punched out of sheet metal) has its forward end bentdownward to form an air deflector 27. A compression spring 28 isinterposed between the air tube 6 and the lever 24 rearwardly of thepivot pin 25 and continuously tends to swing the forward lever armdownwardly, so as to have the air deflector 27`extend across the axis Aof the air tube. But the swinging of the lever in this direction islimited by a screw 28 which is threaded through the forward l-ever armand has its lower end disposed for engagingthe top of the air tube. Withthis embodiment, a downward pressure on the rear lever arm (as by thefinger 29) will rock the lever so as to raise the air deflector out Vofthe path of the air projected from the air tube, and the spring willautomatically return the combined air deflector and actuating member tothe screwstopped position when the pressure of the finger isdiscontinued.

l/Vith each of the illustratedl embodiments,

the axes of the liquid nozzle and of the discharge passage O of the airtube should be in a common vertical plane, such as the plane P in Fig.8, to insure symmetry in the resulting spray. However, no great accuracyof manufacture is otherwise required for either embodiment. Moreover, itwill be obvious that an exceedingly small amount of machining isrequired for our entirely valveless spray appliance, that the assemblingis quite simple; and that the entire spray gun portion can be muchlighter than that of types which include interior valves andvalve-actuating mechanisms. i

Y We claim as our invention:

1. Ina spraying appliance, a container for liquid, a body memberincluding a base seated on the container, a riser on the base, an airtube extending across the top of the riser,

Y and a handle depending from the rear end of the air tube, the air tubehaving its outlet above the said base; a liquid tube extending upwardlythrough the top of the container and the base, and having its outletdisposed forwardly of the loutlet of the air tube, the axes of bothoutlets being in a common vertical plane and the upper end of the outletof the liquid tube outlet being below the axis -of the air tube; an airdeflector pivoted to a forward portion of the air tube on a horizon- Ytal axis transverse of the axis of the air tube,

the air deiiectcr having a portion thereof adapted to extend across themouth of the Lair tube whenthe airdeflector is in one posiliquid, a bodymember including a base seat ed on the container, a riser on the base,an

air tube extending approximately horizontally across the top of theriser, and a handle depending from the rear end of the air tube, the airtube having its outlet above the said base; a liquid tube extendingupwardly through the top of the container and the base, and havingitsoutlet disposed forwardly of the outlet of the air tube, the axes ofboth outlets being in a common vertical plane and the upper end of theliquid tube outlet being below the axis of the air tube; an airdeflector pivoted to a forward portion of the air tube on a horizontalaxis transverse of the axis of the air tube,.the deflector having aportionV thereof adapted toV extend across the mouth l of the air tubewhen-the said deflector is in one position; a slide extending throughthe riser below the air tube and connected to the air defl-ector; springmeans interposed between the slide and aportion of the body member forcontinually urging the slide in a direction in which the slide causesthe deflector to be in the aforesaid position; and a combined stop andtrigger element fast upon the slide behind the riser and forwardly ofthe handle, the said element including a. depending trigger andshouldered portion forwardlyof the trigger and disposed for engaging theriser when the` slide issuiiiciently moved by the spring in thefirstnamed direction to dispose the'air deflector in its said position. y

A 3. Ina spraying appliance, a container-for liquid, a riser tubedepending into and extending above the container andhavinga contractedliquid outlet at its upper end; an air tube extending transversely ofthe said riser tube above the container and having a contracted airoutlet disposed adjacent to the said liquid outlet, with the axis oftheair outlet above the liquid outlet; an 'imperforate air deflectorpivoted upon the air tube and movable into and out of a position inwhich the said deflector extends between the said two outlets, the airdeflector being formed for upwardly deiiecting air issuing from the saidair outlet.

posed between the two outlets.

5. In a spraying appliance, a container for liquid, a'riser tubedepending into and extending above the container and having a4contracted liquid outlet at its upper end; an

air tube extending transversely of the said tube above the container andhaving a con-l tracted air outlet disposed adjacent to the said outletand with the axis of the air outlet above the liquid outlet; anairdelector pivoted to the air tube and movable into and out of aposition in which a portion of the air deiiector is disposed between thetwo outlets, a` retracting member slidably supported below the air tubeand connected to the air deflector for moving the air deflector in onedirection, 'and spring means opposing such movement of the retractingmember.

6. In a spraying appliance, a base member,

a liquid tube and an air tube'supported by the base member with the axesof the two' tubes relatively transverse, and with the outlets of the twoducts so disposed that air issuing from the air tube will blow acrossthe outlet of the liquid duct to produce suctionin the liquid tubetowards the outlet of that tube; and an upwardly open scoop-shaped airdeiiector having its sides extending at opposite sides'of the air' tubeand Shaving the upper ends of its sides conjointly pivoted to the airtube, the deflector being movable into and out of a position in whichits back ex-` tends across the axis of the air tube.

7. In a spraying appliance, a container for liquid, a bodyy memberincluding a base seated on the container, a riser on the base, an air'tube' extending approximately horizontally across the top of the riser,and a handle depending from the rearend of the air tube, the air tubehaving its outlet above the said base; a liquid tube extending upwardlythrough the top of the container andthe base, and having its outletdisposed forwardly of the outlet of the air tube, the axesvof bothoutlets being in a common vertical plane and the upper end of the liquidduct outlet being slightly below the axis of the air tube; an airdeflector pivoted to a forward portion of the air tube on a horizontalaxis transverse of vthe axis of the air tube, the deflector havingavportion thereof adapted to extend acrossf the axis of the air tubewhen the said deflector ati is in oneposition; andan actuating member Yextending slidably through the riser and into e the handle and connectedto the air'deflector. 8. A spraying appliance as per claim 7,incombination with spring means interposed between the actuating memberand the handle for continuouslyurging the actuating member in thedirection in which the latter causes the deflector to extend across theaxis of the air tube. V Y

9. A spraying appliance as per claim 7, in combination with spring means-interposed between the actuating member and the handle for continuouslyurging the actuating les

